US2570116A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color developers for the production of azine dye images
Assignee: GAF Chemicals Corp
•
Filing: 1949-06-28
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Granted: 1951-10-02
•
Expires: 1969-06-28
Abstract
No abstract record available.
Inventors
- 👤 Robert C Gunther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:37
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/3244
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
24 words
A PHOTOGRAPHIC DEVELOPER COMPRISING AN ALKALINE AQUEOUS SOLUTION OF AN ALKALINE METAL SULFITE AND A COMPOUND SELECTED FROM THE CLASS OF THE FOLLOWING CONSTITUTION:
Claim 2
Dependent Claim
24 words
A PHOTOGRAPHIC DEVELOPER COMPRISING AN ALKALINE AQUEOUS SOLUTION OF AN ALKALINE METAL SULFITE AND A COMPOUND SELECTED FROM THE CLASS OF THE FOLLOWING CONSTITUTION:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-01 | 1955-04-02 | 1955-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-01 | 1959-04-02 | 1959-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-01 | 1963-04-02 | 1963-10-02 | $7700.00 | Window Closed / Lapsed |